Dynamics and environmental regulation of the maximum leaf water use efficiency of <i>Vitex negundo</i> var. <i>heterophylla</i> during growing season

Pan Mengting; Zhang Dehuai; Gao Na; Xu Mingze; Li Xinhao; Tian Yun; Liu Peng; Jia Xin; Zha Tianshan

doi:10.12171/j.1000-1522.20220347

Journal of Beijing Forestry University > 2023 > 45(6): 52-61. > DOI: 10.12171/j.1000-1522.20220347

Pan Mengting, Zhang Dehuai, Gao Na, Xu Mingze, Li Xinhao, Tian Yun, Liu Peng, Jia Xin, Zha Tianshan. Dynamics and environmental regulation of the maximum leaf water use efficiency of Vitex negundo var. heterophylla during growing season[J]. Journal of Beijing Forestry University, 2023, 45(6): 52-61. DOI: 10.12171/j.1000-1522.20220347

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Dynamics and environmental regulation of the maximum leaf water use efficiency of Vitex negundo var. heterophylla during growing season

Pan Mengting^{1, 2,},
Zhang Dehuai³,
Gao Na³,
Xu Mingze^{1, 2},
Li Xinhao^{1, 2},
Tian Yun^{1, 2, ,},
Liu Peng^{1, 2},
Jia Xin^{1, 2},
Zha Tianshan^{1, 2}

1.
School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
2.
Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
3.
Beijing Miyun District Landscaping Bureau, Beijing 101599, China

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Received Date: August 18, 2022
Revised Date: September 24, 2022
Available Online: May 07, 2023
Published Date: June 24, 2023

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Abstract

Abstract

Objective Water use efficiency (WUE) is an important indicator of carbon and water coupling in ecosystems, and its relationship with environmental factors has attracted much attention. However, the adaptation mechanism of plant potential water use capacity to environmental change has been rarely reported. This study was to explore the seasonal dynamics of potential leaf water use efficiency and its environmental controls in Vitex negundo var. heterophylla, the dominant shrub species of Pinus tabuliformis in Beijing.
Method We measured the photosynthesis and transpiration of photosynthesis-light response curves and calculated corresponding instantaneous water use efficiency (WUE_i) from June to October, 2021 using a portable photosynthesis analyzer. In addition, the micrometeorological in situ observation method was used to determine the environmental factors such as air temperature (T_a), soil moisture content (SWC), air vapor pressure deficit (VPD_a) and so on. Fitting model of WUE_i against light was used to get the maximum water use efficiency (WUE_max). On this basis, the seasonal dynamics of WUE_max and the relationship between WUE_max and environmental factors were analyzed.
Result Consequently, the WUE_max descended first and then stayed steady during the growing season, ranging from 2.84 to9.17 μmol/mmol, with a mean of 4.79 μmol/mmol. Seasonal variations in WUE_max were mainly affected by SWC and T_a. Among them, SWC was the key environmental factor regulating WUE_max. WUE_max was negatively correlated with SWC, and SWC was mainly affected WUE_max through leaf stomatal conductance (g_c). WUE_max was positively correlated with T_a, and T_a mainly affected WUE_max by regulating photosynthetic carboxylase activity.
Conclusion In the humid environment, Vitex negundo var. heterophylla mainly adapts to the environment through the water resource acquisition strategy. High SWC and T_a are inhibitory factors for WUE_max in leaves of Vitex negundo var. heterophylla.
- maximum water use efficiency,
- soil water content,
- air temperature,
- Vitex negundo var. heterophylla,
- seasonal dynamic

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Dynamics and environmental regulation of the maximum leaf water use efficiency of Vitex negundo var. heterophylla during growing season

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Dynamics and environmental regulation of the maximum leaf water use efficiency of Vitex negundo var. heterophylla during growing season

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